Poligradium latus
Poligradium dureali relied on particulate matter suspended in the water column for food. P. dureali populations that had wider mouths were able to take in more water and feed on more particulate matter. This led to the evolution of Poligradium latus.
P. latus has a wider mouth for processing more water and the first pair of appendages have adapted to pushing water into the mouth. This behavior developed because as the forelimbs moved forward during swimming they would push water towards the mouth, over time the limbs pushed forward stronger because individuals with stronger forelimbs were able to obtain more food. Water is push into the mouth, filtered, and push out before taking water in again. The remaining four pairs of appendages have increased in size to make up for the loss of thrust from the first pair of appendages. P. latus mainly feeds on particulate organic matter but will feed on microscopic organisms like Libraphotocyanus cytosol and the free swimming cells of Polysomus snealensis
P. latus is 2.5mm and reproduces asexually through rupturing of the body wall releasing 100-200 eggs and disintegration of the body to feed the new young. P. latus retains clear skin and two pairs of light sensing eyes from its ancestor. It reaches mature size in a week and holds eggs it produces in its body until they are released.